Sony UP-21MD Service Manual page 46

Time-sharing timing
(1) VBLNK period
* DRAM access
° VF judgment
»* Write of color adjustment data
Ee] (2) HBLNK period
* DRAM access
(3) Effective screen period
* DRAM access
* Input and output of capture or monitor output image data
| (A) DRAM-refresh-
(B) DRAM access of capture or monitor output image data
(C) Output of print data, and write or read of caption data
Command communication with SY board
Asynchronous serial communication
° Start bit: 1
* Data bit:. 8
* Stop bit: 1
* Parity bit: None
* Baud rate: 19200 bps
UP-21MD V1